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-rw-r--r--docker/errors.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/docker/errors.py b/docker/errors.py
index fb9cb5a..d15e332 100644
--- a/docker/errors.py
+++ b/docker/errors.py
@@ -78,3 +78,7 @@ class TLSParameterError(DockerException):
"client configurations. See "
"http://docs.docker.com/examples/https/ for "
"API details.")
+
+
+class NullResource(DockerException, ValueError):
+ pass